Electrode holder for arc lamps



5 Feb. 26, 1929. 1,703,595

J. R. QUAIN ELECTRODE HOLDER FOR ARC LAMPS Filed Aug. 26, 1927 Patented Feb. 26, 1929.

UNITED STATES PATENT OFFICE.

ELECTRODE HOLDER FOR ARC LAMPS.

Application filed August 26, 1927, Serial No. 215,719, and in Great Britain January 25, 1926.

This invention has reference to means for holding, supporting, and adjusting the electrodes ot an arc lan'ip, and has for its object to produce a simple and eii'ective means whereby the carbons can be easily, expeditiously and accurately adjusted with perfect safety, this application. being a continuation in part or application Serial No. 16l,627, filed January l'l',

riccording to this inventioi'i the holder or part in which the electrode is inserted is made in. the "form of a tube screw threaded externally a portion of its length to screw into a collar, forming the electrical connection, fixed in the end of a supporting partmade or ebonite or other non-conducting material.

This supporting part is formed tubular so as to it loosely over the holder, and is provided the rear end with a flange for secur- 20 lllj the (lPJlCB in position, and an opening in the nut where the collar is fixed to permit the rical lead to be connected to said collar, said lead being enclosed by a cap or cover, made of non-conducting material, which screws into said opening. Fitting loosely on the outer end of the supporting part is a s ,e e provided with a knob or thumb piece, so made of nortconducting material, which sleeve is locked or fixed to the extreme outer c d oi the holder by a pin or equivalent. A lccl; nut is provided on the opposite end of the holder which fixes the electrode in posi tion and permits said electrode to be adjusted or moved in, the holder as the electrode is consinned.

The invention is illustrated on the accom pa nvin drawing.

Fin". 1 is a longitudinal sectional view of a carbon holder and support constructed according to this invention.

Fig. 2 a view of the holder and support showirc' an electrode fixed therein.

A represents the holder or part in which the carbon B is inserted. a the lock nut that secures the carbon in its holder, (0 the threaded portion of the holder which screws into the collar (Z fixed in the end of the support D,

. e ect cl the flange or equivalent by which the device secured in position, (Z the cap or cover which encloses the lead that is connected to the collar d, (i the tubular part or the sup port that this loosely over the holder A, E, the sleeve which lit-s loosely on the outer end of the support I), c the knob or handle provided on the end of the sleeve D by which the holder ii is manipulated, and e the pin which fixes the said sleeve E to the holder A.

it will be seen, on reference to Fig. 1, when the knob operated that the holder A moves further in or out of the support D, tln eby enabling the electrode B to be moved into proper relationship with the other electrode necessary to form the are, which other electrode may be held and supported in a holder correspondingly -1:onstructed. Further, as the protruding end of the electrode is consumed will be seen by slackening the nut m that the electrode can be pushed forward in the holder A and then locked in position, thereby enabling practically the whole of the elect-rode to be used.

The contact springs a are provided to ensure Iier'tect contact between the holder A and the collar d.

What I claim and desire to secure by Letters Patent 'l. An electrode holder comprising a support, an electrode holding tube extending through and screw-threzuled within said support. and a knob on one end portion of said tube and having a sleeve telescoping over a portion of said support and insulated there from.

2. An electrode holder comprising a support having a, tubular flange at one end, a collar fitted within said support at its opposite end, an electrode holding tube extending through said support and screw-threaded within said collar, and a knob on said tube having a sleeve in telescoping relation with said flange and insulated therefrom.

In testimony whereof I have signed my name to this specification.

JOHN ROBERT QUAIN. 

